hwmon: qpnp-adc: Add synchronous vadc and iadc api
Support simultaneous voltage and current ADC request
to read vbatt and battery current. The IADC peripheral
issues the simultaneous VADC/IADC sync request. The
VADC peripheral is first prepared to issue an voltage
ADC request but does not request the conversion. The
IADC peripheral sets its conversion request and issues
an ADC request for simultaneous read. The api is
intended to be used by the BMS.
Change-Id: I978db99662313d7344bd2e4c8534f23cab398011
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
diff --git a/include/linux/qpnp/qpnp-adc.h b/include/linux/qpnp/qpnp-adc.h
index a3347c4..0f70fb3 100644
--- a/include/linux/qpnp/qpnp-adc.h
+++ b/include/linux/qpnp/qpnp-adc.h
@@ -1149,6 +1149,23 @@
*/
int32_t qpnp_adc_usb_scaler(struct qpnp_adc_tm_usbid_param *param,
uint32_t *low_threshold, uint32_t *high_threshold);
+/**
+ * qpnp_vadc_iadc_sync_request() - Performs Voltage ADC read and
+ * locks the peripheral. When performing simultaneous
+ * voltage and current request the VADC peripheral is
+ * prepared for conversion and the IADC sync conversion
+ * is done from the IADC peripheral.
+ * @channel: Input channel to perform the voltage ADC read.
+ */
+int32_t qpnp_vadc_iadc_sync_request(enum qpnp_vadc_channels channel);
+/**
+ * qpnp_vadc_iadc_sync_complete_request() - Reads the ADC result and
+ * unlocks the peripheral.
+ * @result: Structure pointer of type adc_chan_result
+ * in which the ADC read results are stored.
+ */
+int32_t qpnp_vadc_iadc_sync_complete_request(
+ enum qpnp_vadc_channels channel, struct qpnp_vadc_result *result);
#else
static inline int32_t qpnp_vadc_read(uint32_t channel,
struct qpnp_vadc_result *result)
@@ -1218,6 +1235,13 @@
static inline int32_t qpnp_adc_tm_scale_voltage_therm_pu2(
uint32_t reg, int64_t *result)
{ return -ENXIO; }
+static inline int32_t qpnp_vadc_iadc_sync_request(
+ enum qpnp_vadc_channels channel)
+{ return -ENXIO; }
+static inline int32_t qpnp_vadc_iadc_sync_complete_request(
+ enum qpnp_vadc_channels channel,
+ struct qpnp_vadc_result *result)
+{ return -ENXIO; }
#endif
/* Public API */
@@ -1226,7 +1250,7 @@
/**
* qpnp_iadc_read() - Performs ADC read on the current channel.
* @channel: Input channel to perform the ADC read.
- * @result: Current across rsens in mV.
+ * @result: Current across rsense in mA.
*/
int32_t qpnp_iadc_read(enum qpnp_iadc_channels channel,
struct qpnp_iadc_result *result);
@@ -1245,7 +1269,6 @@
* type qpnp_iadc_calib.
*/
int32_t qpnp_iadc_get_gain_and_offset(struct qpnp_iadc_calib *result);
-
/**
* qpnp_iadc_is_ready() - Clients can use this API to check if the
* device is ready to use.
@@ -1253,6 +1276,19 @@
* has not occured.
*/
int32_t qpnp_iadc_is_ready(void);
+/**
+ * qpnp_iadc_vadc_sync_read() - Performs synchronous VADC and IADC read.
+ * The api is to be used only by the BMS to perform
+ * simultaneous VADC and IADC measurement for battery voltage
+ * and current.
+ * @i_channel: Input battery current channel to perform the IADC read.
+ * @i_result: Current across the rsense in mA.
+ * @v_channel: Input battery voltage channel to perform VADC read.
+ * @v_result: Voltage on the vbatt channel with units in mV.
+ */
+int32_t qpnp_iadc_vadc_sync_read(
+ enum qpnp_iadc_channels i_channel, struct qpnp_iadc_result *i_result,
+ enum qpnp_vadc_channels v_channel, struct qpnp_vadc_result *v_result);
#else
static inline int32_t qpnp_iadc_read(enum qpnp_iadc_channels channel,
struct qpnp_iadc_result *result)
@@ -1262,6 +1298,10 @@
{ return -ENXIO; }
static inline int32_t qpnp_iadc_is_ready(void)
{ return -ENXIO; }
+static inline int32_t qpnp_iadc_vadc_sync_read(
+ enum qpnp_iadc_channels i_channel, struct qpnp_iadc_result *i_result,
+ enum qpnp_vadc_channels v_channel, struct qpnp_vadc_result *v_result)
+{ return -ENXIO; }
#endif
/* Public API */